[libvirt-users] virConnectOpen question.

Hi, I am using virConnectOpen(const char *uri) to connect to the local hypervisor. When uri is set to "lxc:///", an error gets logged in /var/log/messages about failed connection. But I do not see any error for "xen:///". The machine does not have these drivers installed, and I am using libvirt 0.6.3. My questions are - 1. Why I see error in /var/log/messages for container and not for xen? 2. Is there a way to avoid this error? Can I check for installed drivers before trying to connect? Thanks Sharad Mishra